I don't know what your instruction booklet says for the SR9c, and there isn't one available on the Ruger site, but here is the direct quote from the SR9 booklet avaiable on the Ruger web site:
"The SR9(TM) pistols are compatible with all factory ammunition of the correct caliber loaded to U.S. Industry Standards, including high-velocity and hollowpoint loads, loaded in brass, aluminum, or steel cartridge cases. No 9mm Parabellum ammunition manufactured in accordance with NATO, U.S., SAAMI, or CIP standards is known to be beyond the design limits or known not to function in these pistols."
Pretty much tells me that as long as it meets the above standards, it's good. Should say on the ammo box if it has been manufactured in accordance with one or more of the standards noted.
John